On account of your ghost like body naturally formed or non-magical difficult terrain poses no impasse on your movement capabilities. For the purposes of this trait any terrain created by magic through the manipulation of pre-existing material eg: mold earth, is considered as non-magical

Finding you are closer to floating than standing you are considered to have an innate hover speed equal to your walk speed however you cannot rise more than one foot off the ground with this trait.

You have resistance to Necrotic damage as well as do not need to eat drink sleep or breathe to survive are immune to disease and cannot be put to sleep magically, when long resting rather than falling asleep your body approaches closer to death than life giving you disadvantage on perception checks for the 6 hours you must stay immobile, treat the other two hours of a long rest as downtime like normal. To features that detect Undead you appear to be an Undead however for purposes of creature type you are still considered humanoid.

Due to the ethereal nature of your form you have proficiency in the stealth skill and can move through another creatures space at no extra movement cost regardless of the creatures size, if you end your turn inside another creature you are instead shunted to the nearest unoccupied space taking 1d10 force damage

Bound Souls are hardy creatures that have persisted after death through perseverance and willpower, because of this they have a +2 in CON and a +1 in WIS

You have the ability to see within dark and dim light out to a range of 60 ft as if it were bright, you cannot discern color in this darkness only shades of grey

In the moment of your death your soul was trapped inside a closeby object, this object is what now allows you to cling to life and maintain your memories unlike a common undead. It has immunity to all damage not caused by a weapon made of infernal iron or capable of otherwise harming a soul. When you die your corporeal form vanishes leaving behind only this object as well as whatever you were wearing or carrying, for the purposes of revival this object is considered your body however when revived using it you come back once more as a Bound Soul rather than as your original self.

Bound Souls are the remants of a dead being, as such they know common as well as one other language that they knew in life